/*********************************************************************
 * Copyright (C) 2005 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.biff.formula;

import jxl.common.Logger;

/**
 * An cell reference error which occurs in a formula
 */
class CellReferenceError extends Operand implements ParsedThing {
    /**
     * The logger
     */
    private static Logger logger = Logger.getLogger(CellReferenceError.class);

    /**
     * Constructor
     */
    public CellReferenceError() {
    }

    /**
     * Reads the ptg data from the array starting at the specified position
     *
     * @param data the RPN array
     * @param pos the current position in the array, excluding the ptg identifier
     * @return the number of bytes read
     */
    public int read(byte[] data, int pos) {
        // the data is unused - just return the four bytes

        return 4;
    }

    /**
     * Gets the cell reference as a string for this item
     *
     * @param buf the string buffer to populate
     */
    public void getString(StringBuffer buf) {
        buf.append(FormulaErrorCode.REF.getDescription());
    }

    /**
     * Gets the token representation of this item in RPN
     *
     * @return the bytes applicable to this formula
     */
    byte[] getBytes() {
        byte[] data = new byte[5];
        data[0] = Token.REFERR.getCode();

        // bytes 1-5 are unused

        return data;
    }

    /**
     * If this formula was on an imported sheet, check that
     * cell references to another sheet are warned appropriately
     * Does nothing
     */
    void handleImportedCellReferences() {
    }
}
